JPS62237207A - Liquid fuel combustion device - Google Patents

Abstract

PURPOSE:To prevent evaporated fuel from recondensing in a combustion cylinder and to prevent production of smoke due to afterburning, by a method wherein a flow uniformizing member, guiding air for combustion, fed from an air feed port to an air accumulating chamber, to the secondary air hole side along an outer cylinder and guiding a part of air for combustion on the secondary air hole side to a primary air hole along an inner cylinder, is provided in the air accumulating chamber. CONSTITUTION:With a burner motor 22 run, a blast fan 20 and a rotor 24 are rotated at a high speed, and air for combustion, sucked from an air suction port 19 into a fan case 18, is fed through an air feed port 17 to an air accumulating chamber 14. The fed air is guided to the secondary air hole 16 side along an outer cylinder 13 by means of a flow uniformizing cylinder 29, a part thereof is exhausted in a combustion cylinder 11, and the rest is guided to the primary air hole 15 side along an inner cylinder 12 and is exhausted in the combustion cylinder 11. Air for combustion guided to the primary air hole 15 receives a combustion heat through the inner cylinder 12 by migration to gasifying combustion for preheat. This constitution increases the temperature of the internal bottom of the combustion chamber 11, and enables fuel evaporated in an evaporating cylinder 23 to be prevented from recondensing at the bottom of the interior of the combustion cylinder 11.

Description

[Detailed Description of the Invention] B) Industrial Application Field This invention is used as a heat source for hot water boilers, water heaters, space heaters, etc., by vaporizing liquid fuel such as kerosene and mixing it with air in advance. The present invention relates to a liquid fuel combustion device that generates and burns a mixed gas of fuel and air.

0) Prior art The applicant has proposed this type of liquid fuel combustion device as shown in FIG. 2 (Utility Application No. 119450/1982).

This liquid fuel combustion device forms an air storage chamber 3 between a bottomed inner cylinder 1 and an outer cylinder 2, and a large number of primary air holes 4 and secondary air holes in the bottom wall IA and peripheral wall IB of the inner cylinder 1, respectively. Air hole 5
A bottomed vaporization tube 7 that opens on the bottom wall side of the combustion tube 6 is provided in the combustion tube 6 formed by perforating the combustion tube 6 with a gap from the combustion tube 86, and a fuel atomization tube 7 is provided inside the combustion tube 7. A rotor 8 and an ignition device 9 are provided, and combustion air is supplied to the storage chamber 3 from an air supply port (not shown) in the center of the bottom wall of the outside t17t2 of the combustion tube 6, and The structure is such that liquid fuel is supplied to the rotor 8 rotating at high speed from a fuel supply pipe 1o disposed in the rotor 8.

In the liquid fuel combustion device described above, pre-combustion at the time of starting is carried out in the vaporization cylinder 7.
Gasification combustion occurs inside the secondary air hole 5 in the combustion tube 6.
Since each combustion is performed in the vicinity of , there is an advantage that the transition from precombustion to gasification combustion can be performed quickly while properly mixing fuel and air in each combustion.

(c) Problems to be Solved by the Invention Incidentally, in such a liquid fuel combustion device, combustion air is directly supplied into the combustion cylinder from the primary air hole 4 of the inner cylinder bottom wall IA. Wall IA is cooled with combustion air. Moreover, since the bottom wall IA of the inner cylinder is far from the flame formation position and its temperature does not rise much during combustion, a portion of the fuel vaporized in the vaporization tube 7 immediately after the start of combustion is regenerated at the lower temperature inner bottom of the combustion tube 6. It condenses and becomes oil droplets on the bottom wall of the inner cylinder IA.
There were times when I had to attend to him. For this reason, when the fire is extinguished after a short period of combustion, the oil droplets on the bottom wall IA of the inner cylinder may become afterburned, producing soot and smoke. In addition, the oil droplets turned into a tar-like substance, causing stains on the bottom wall IA of the inner cylinder.

This invention was made in view of the above facts,
The purpose is to prevent vaporized fuel from recondensing within the combustion cylinder, prevent the generation of soot and smoke due to afterburning, and keep the inside of the combustion cylinder clean.

<Means for Solving Town Problems> This invention forms an air storage chamber between a bottomed inner cylinder and an outer cylinder, and a large number of primary air holes and secondary air holes in the bottom wall and peripheral wall of the inner cylinder, respectively. A combustion tube formed with air holes, an air supply port provided in the center of the bottom wall of the outer tube of the combustion tube, and an air supply port disposed within the combustion tube with an interval from the combustion tube, and a combustion tube. This invention improves a liquid fuel combustion device that is equipped with a bottomed vaporization cylinder that opens on the bottom wall side of the cylinder, and a fuel atomization rotor and an ignition device that face the inside of the vaporization cylinder.

In this invention, the combustion air supplied from the air supply port to the storage chamber is guided along the outer cylinder to the secondary air hole side, and a part of the combustion air on the secondary air hole side is guided to the primary air cylinder along the inner cylinder. This is a configuration in which a rectifying member that guides the air to the air hole is provided in the air storage chamber.

(f) Function With this configuration, the combustion air that has been completely supplied from the air supply port to the storage chamber is guided by the T-flow member along the outer cylinder to the secondary air hole side, and from the secondary air hole to the combustion cylinder. Exhaled inward.

Further, a part of the combustion air on the side of the secondary air hole is guided along the inner cylinder to the primary air hole while receiving combustion heat, and is discharged into the combustion cylinder. In this way, the primary air supplied from the air storage chamber into the combustion cylinder is preheated using combustion heat, so the temperature at the bottom of the combustion cylinder is increased, and the fuel vaporized in the vaporization cylinder is heated inside the combustion cylinder. There is no need to worry about recondensation at the bottom of the tank.

(F) Embodiments The present invention will be described in detail below based on embodiments shown in the drawings.

In FIG. 1, the combustion cylinder 11 consists of an inner cylinder 12 and an outer cylinder 13, each having a bottomed cylindrical shape and having their upper ends joined to each other.
An air storage chamber 14 is formed between the outer cylinder 13 and the outer cylinder 13 . Also,
A large number of primary air holes 15 and secondary air holes 16 are provided at the periphery of the bottom wall 12A and the upper part of the peripheral wall 12B of the inner cylinder 12, respectively, and an air supply port 17 is provided at the center of the bottom wall 13A of the outer cylinder 13. It is being A fan case 1B is connected to the bottom wall 13A of the outer cylinder 13. The fan case 18 has an air suction port 19 and accommodates a blower fan 20 that sucks combustion air from the air suction port 19, and a burner motor 22 that drives the blower fan 20 with a motor shaft 21. A bowl-shaped vaporizer tube 23 that opens on the bottom wall side of the combustion tube 11 is disposed in the upper part of the combustion tube 11 . A fuel atomizing rotor 24 fixed to the motor shaft 21 and an ignition device 25 consisting of a spark plug are exposed inside the carburetor cylinder 23. Further, a fuel supply pipe 26 is disposed near the rotor 24, and a flame detector 27 made of a flame rod is disposed near the secondary air hole 16 in the combustion chamber 11. Further, a flame-holding ring 28 is attached to the open end of the inner n12 to deflect the flow of secondary air discharged from the secondary air hole 16 toward the bottom wall of the combustion tube 11.

The air storage chamber 14 has a primary air hole 15 with respect to the air supply port 17.
A cylindrical rectifier cylinder 29 with a bottom and open on the side of the secondary air hole 16 is provided.

Next, the operation of the above-described embodiment device will be explained.

When the burner motor 22 is operated, the blower fan 20 and the rotor 24 rotate at high speed, and the combustion air sucked into the fan case 18 from the air suction port 19 is transferred to the air supply port 17.
The air is supplied to the storage chamber 14 through the air. And the air storage chamber 14
The combustion air supplied to the combustion chamber 29 is guided along the outer cylinder 13 to the secondary air hole 16 side by the straightening cylinder 29, where a part is discharged from the secondary air supply hole 16 into the combustion cylinder 11,
The remainder is guided to the primary air hole 15 along the inner M12, and is discharged from the secondary air hole 15 into the combustion cylinder 11. On the other hand, when liquid fuel is ejected from the fuel supply pipe 26, this fuel hits the rotor 24 and is atomized, and the fuel is atomized from the secondary air hole 15 to the combustion tube 1.
The air collides with the inner wall of the vaporizer cylinder 23 while being mixed with the primary air flowing into the vaporizer cylinder 23 . At this time, when the ignition device 25 is activated, the mixed gas in the vaporizer cylinder 23 is ignited, and combustion starts. Due to this combustion, the vaporization tube 23 is rapidly heated to a temperature higher than that required to vaporize the liquid fuel.

When combustion takes place inside the carburetor cylinder 23 in this way, -
Since the amount of air flowing into the vaporizer n23 from the secondary air hole 15 is limited by the position, number, hole diameter, etc. of the primary air hole 15, the inside of the vaporizer tube 23 quickly becomes oxygen-deficient, and the combustion flame is transferred to the outside of the vaporizer tube. into the combustion cylinder 11. Then, the fuel atomized by the rotor 24 hits the inner wall of the vaporization tube 23 and receives combustion heat, becoming vaporized gas. After this vaporized gas is premixed with the air discharged from the primary air hole 15, it reaches the vicinity of the secondary air hole 16, where sufficient air is replenished to perform gasification and combustion. Further, since a flame stabilizing ring 28 is provided near the secondary air hole 16, a vortex is formed when the secondary air collides with the gaseous mixture of vaporized gas and -hogaku gas, and the gasification combustion flame is The flame is held by the flame holding ring 28. The vaporization cylinder 23 is completely heated by this gasification combustion and is maintained at a high temperature, so that fuel is rapidly vaporized inside the vaporization cylinder 23.

According to this embodiment, the combustion air supplied from the air supply port 17 to the storage chamber 14 is passed along the outer cylinder 13 to the secondary air hole 16.
A part of the combustion air on the secondary air hole side is guided to the inner cylinder 12.
The rectifying cylinder 29 that guides the primary air hole 15 along the air storage chamber 14
Since the combustion air is introduced into the secondary air hole 15, the combustion air is gasified and combusted.

The cylinder receives combustion heat through the inner cylinder 12 and is preheated.

Therefore, the temperature at the bottom of the combustion tube 11 is increased, and the fuel vaporized in the vaporization tube 23 can be prevented from recondensing at the bottom of the combustion tube 11.

(G) Effects of the Invention Since the present invention is configured as described above, it is possible to rapidly transition from precombustion to gasification combustion and to reduce the amount of combustion air discharged from the secondary air hole into the combustion cylinder. The combustion heat can be used for preheating to increase the temperature at the bottom of the combustion cylinder, and it is possible to prevent vaporized fuel from re-condensing at the bottom of the combustion cylinder. For this reason, there is no fear that oil droplets will extend onto the bottom wall of the combustion tube, and it is possible to prevent the generation of soot and smoke due to oil droplets and to keep the inside of the combustion tube clean.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a liquid fuel combustion device showing an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of a conventional liquid fuel combustion device. 11... Combustion tube, 12... Inner tube, 12A...
・Bottom wall, 12B...peripheral wall, 13...outer cylinder,
13A... Bottom wall, 14... Air storage chamber, 1
5... Secondary air hole, 16... Secondary air hole, 17
...Air supply port, 23...Carbonizer cylinder, 24...
- Rotating body, 25... Ignition device, 29... Rectifier tube. Applicant Sanyo Electric Co., Ltd. and 1 other agent Patent attorney Takuji Nishino and 1 other person Figure 1 fj521!1 1A

Claims (1)

[Claims] (1) A combustion cylinder formed by forming an air storage chamber between a bottomed inner cylinder and an outer cylinder, and having a large number of primary air holes and secondary air holes perforated in the bottom wall and peripheral wall of the inner cylinder, respectively. and an air supply port provided in the center of the bottom wall of the outer cylinder of the combustion cylinder, and an air supply port disposed within the combustion cylinder with a gap from the combustion cylinder, and opened at the bottom wall side of the combustion cylinder. In a liquid fuel combustion device equipped with a bottomed vaporization cylinder, a rotor for fuel atomization, and an ignition device facing into the vaporization cylinder, combustion air is supplied from an air supply port to an air storage chamber. The air storage chamber is provided with a rectifying member that guides the combustion air along the outer cylinder toward the secondary air hole and guides a part of the combustion air on the secondary air hole side along the inner cylinder to the primary air hole. Liquid fuel combustion equipment.